Movie traces traffic jam in stellar jet

Hubble provides time-lapse view of superheated gas flow

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Plasma spewing from the poles of newborn stars moves in clumps that travel at different speeds. When fast-moving particles run into slower material on these cosmic freeways, the resulting “traffic jams” create shock waves that travel trillions of miles. In this picture, glowing material from a star called HH 47 flows from left to right.

A new animation of a high-speed cosmic pileup has been created using images from the Hubble Space Telescope.

Superheated gas called plasma, spewing from a newborn star, travels in clumps that move at different speeds. Fast-moving, recently ejected clumps sometimes catch up with slower batches that had been sent out previously.

The resulting traffic jams create massive shock waves that travel trillions of miles across the cosmos.

The movie helps astronomers trace the stellar jet in order to better understand it and the newborn star from which it emanates.

The animation was released Monday, and an analysis of it was published in the November issue of the Astronomical Journal.

"When it comes to actually showing exactly what's going on, there's just nothing like a movie," said study co-author Patrick Hartigan, associate professor of physics and astronomy at Rice University. "You can look at a still image and make up all kinds of stories, but they all go out the window when you see a movie."

Origin of a jet
Stars form out of giant clouds of gas and dust. Within these clouds, gravity pulls material together into a tight ball surrounded by a large spinning disk of material. The disk holds the stuff of planet formation.

Much of the disk material gradually spirals into the star. The resulting energy from this process, which is not fully understood, drives the jets of plasma that erupt from it at perpendicular angles to the spinning accretion disk, which means they shoot out from the stellar poles.

The Hubble images were made in 1994 and 1999. They show the jet streaming from a star named HH 47 in the constellation Vela.

"Our movies give us the ability to track the movement of individual features within the stellar jet, both relative to stationary objects and relative to other objects that are moving within the jet at a different speed," Hartigan said.